feat: add proto_prefix.py

Adds a script that can rewrite the protobuf files with a namespace
prefix, such as arrow.substrait. When public libraries generate their
own internal bindings and don't do this, users of said libraries can
get nasty surprises from the protobuf library (segfaults,
incomprehensible exceptions, or just wrong behavior) if there is even
the slightest difference between different instances of the substrait
namespace, even if those differences are otherwise just non-breaking
changes.

.flake8

@@ -0,0 +1,4 @@
+[flake8]
+ignore = E203, E266, E501, W503, F403, F401
+max-line-length = 88
+select = B,C,E,F,W,T4,B9

.github/workflows/pr.yml

@@ -102,3 +102,29 @@ jobs:
         with:
           node-version: "16"
       - run: ./ci/release/dry_run.sh
+  python-style:
+    name: Style-check and lint Python files
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install dependencies
+      run: python3 -m pip install --upgrade pip black==22.3.0 flake8==4.0.1
+    - name: Black
+      run: python3 -m black --diff --check .
+    - name: Flake8
+      run: python3 -m flake8 .
+  check-proto-prefix:
+    name: Check proto-prefix.py
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: bufbuild/[email protected]
+      - name: Run proto-prefix.py
+        run: tools/proto_prefix.py output test proto go_package=github.com/test/proto
+      - name: Modify buf config to build rewritten proto files
+        run: |
+          echo "version: v1" > buf.work.yaml
+          echo "directories:" >> buf.work.yaml
+          echo "  - output" >> buf.work.yaml
+      - name: Compile rewritten proto files
+        run: buf generate

.pre-commit-config.yaml

@@ -13,3 +13,11 @@ repos:
   hooks:
   - id: commitlint
     stages: [commit-msg]
+- repo: https://github.com/psf/black
+  rev: 22.3.0
+  hooks:
+  - id: black
+- repo: https://gitlab.com/pycqa/flake8
+  rev: 4.0.1
+  hooks:
+  - id: flake8